A conventional revolution is used when the true projection of a feature results in foreshortening.

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A conventional revolution is a method of representing a three-dimensional feature on a two-dimensional surface when the true projection results in foreshortening. It involves rotating the feature around an axis and projecting it onto a plane perpendicular to the axis. This results in a distorted but recognizable representation of the feature.

A Conventional Revolution Is Used When the True Projection of a Feature